Blueberry Pet Soft & Comfortable Jacquard Neoprene Padded Dog Harness, 7 Colors, Matching Collar & Leash Available Separately Chest Girth 21.5-27.5", Width 3/4"; The chest strap is not adjustable. For a safe and fit purchase, be sure to check the neck and chest; A properly fitting collar and harness won't leave any room for your dog to chew. The harness does not stretch itself. NEVER leave your dog unattended with a harness on. Since the reflective threads are stitched into the nylon webbing, it is normal to see that the reflective strings are frayed with the stiches where two layers of webbing are connected. The durability of this harness will not be affected. Please note that the reflective threads are stitched into the webbing on one side only. This harness is a single product. However, it comes with matching collar/leash to complete the look. Collar and leash sold separately. All pictures are taken with our production samples from a size 3/4"(wide) * 21.5-27.5"(chest).